ngx-admin/src/app/@theme/components/header/header.component.ts

import { Component, OnDestroy, OnInit } from '@angular/core';
import { NbMediaBreakpointsService, NbMenuService, NbSidebarService, NbThemeService } from '@nebular/theme';

import { UserData } from '../../../@core/data/users';
import { LayoutService } from '../../../@core/utils';
import { map, takeUntil } from 'rxjs/operators';
import { Subject } from 'rxjs';
import { RippleService } from '../../../@core/utils/ripple.service';

@Component({
  selector: 'ngx-header',
  styleUrls: ['./header.component.scss'],
  templateUrl: './header.component.html',
})
export class HeaderComponent implements OnInit, OnDestroy {

  private destroy$: Subject<void> = new Subject<void>();
  userPictureOnly: boolean = false;
  user: any;

  public currentTheme = 'material-light';
  public readonly themes = [
    { value: 'material-light', name: 'Material Light' },
    { value: 'material-dark', name: 'Material Dark' },
  ];

  userMenu = [ { title: 'Profile' }, { title: 'Log out' } ];

  public constructor(
    private sidebarService: NbSidebarService,
    private menuService: NbMenuService,
    private themeService: NbThemeService,
    private userService: UserData,
    private layoutService: LayoutService,
    private breakpointService: NbMediaBreakpointsService,
    private rippleService: RippleService,
  ) {}

  ngOnInit() {
    this.currentTheme = this.themeService.currentTheme;

    this.userService.getUsers()
      .pipe(takeUntil(this.destroy$))
      .subscribe((users: any) => this.user = users.nick);

    const { xl } = this.breakpointService.getBreakpointsMap();
    this.themeService.onMediaQueryChange()
      .pipe(
        map(([, currentBreakpoint]) => currentBreakpoint.width < xl),
        takeUntil(this.destroy$),
      )
      .subscribe((isLessThanXl: boolean) => this.userPictureOnly = isLessThanXl);

    this.themeService.onThemeChange()
      .pipe(
        map(({ name }) => name),
        takeUntil(this.destroy$),
      )
      .subscribe(themeName => {
        this.currentTheme = themeName;
        this.rippleService.toggle(themeName?.startsWith('material'));
      });
  }

  ngOnDestroy() {
    this.destroy$.next();
    this.destroy$.complete();
  }

  changeTheme(themeName: string) {
    this.themeService.changeTheme(themeName);
  }

  toggleSidebar(): boolean {
    this.sidebarService.toggle(true, 'menu-sidebar');
    this.layoutService.changeLayoutSize();

    return false;
  }

  navigateHome() {
    this.menuService.navigateHome();
    return false;
  }
}